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What's the difference between belongs_to and has_one?
What is the difference between a belongs_to and a has_one ?
5 Answers
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C# nullable string error
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System.String is a reference type and already "nullable".
Nullable<T> and the ? suffix are for value types such as Int32, Double, DateTime, etc.
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Example of multipart/form-data
...0690/895245
To see exactly what is happening, use nc -l or an ECHO server and an user agent like a browser or cURL.
Save the form to an .html file:
<form action="http://localhost:8000" method="post" enctype="multipart/form-data">
<p><input type="text" name="text" value="text defa...
Differences between std::make_unique and std::unique_ptr with new
...that means that this is no longer unsafe. See C++ committee papers P0400R0 and P0145R3.
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Scala: what is the best way to append an element to an Array?
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You can use :+ to append element to array and +: to prepend it:
0 +: array :+ 4
should produce:
res3: Array[Int] = Array(0, 1, 2, 3, 4)
It's the same as with any other implementation of Seq.
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How do I draw a grid onto a plot in Python?
I just finished writing code to make a plot using pylab in Python and now I would like to superimpose a grid of 10x10 onto the scatter plot. How do I do that?
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In Ruby how do I generate a long string of repeated text?
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Indeed, very weird, look how different and elegant looks in Python: str = "0" * 999999 ;)
– tokland
Nov 16 '16 at 19:38
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Can I hide the HTML5 number input’s spin box?
...s the spin-button for webkit browsers (have tested it in Chrome 7.0.517.44 and Safari Version 5.0.2 (6533.18.5)):
input::-webkit-outer-spin-button,
input::-webkit-inner-spin-button {
/* display: none; <- Crashes Chrome on hover */
-webkit-appearance: none;
margin: 0; /* <-...
What exactly do the Vagrant commands do?
There is surprisingly no documentation on what the Vagrant commands do, other than references throughout the "getting started" tutorial.
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how do you filter pandas dataframes by multiple columns
... filter a dataframe (df) by a single column, if we consider data with male and females we might:
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